The APS-C offers more value at a lower cost than E-M1. The D610 full frame is in every respect a far superior camera to the E-M1 for not much extra cost.

If you are only interested in IQ and price (and not weight as this topic is about), you should not compare anything against the most expensive and bulkiest µ4/3 camera Olympus has to offer. Why not compare to E-PM2, that was recently discounted for $250 including with the "pretty decent" kit lens. The IQ should roughly similar as in E-M1.

I was just responding to "truth vs brand fans" where a big deal was made about the E-M1. The E-M1 was the poster child of the great M43 camera as pointed out by one of the M43's biggest fans. Apparently the E-M1 isn't as good a representation of M43 as it was made out to be.